diff --git a/src/lib.rs b/src/lib.rs
index 8b6d2f9..2f67cef 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -341,7 +341,7 @@ impl Aligner<()> {
         let mut aligner = Aligner {
             mapopt: MapOpt {
                 seed: 11,
-                best_n: 1,
+                // best_n: 1,
                 ..Default::default()
             },
             ..Default::default()
@@ -2267,6 +2267,15 @@ mod tests {
         );
     }
 
+    #[test]
+    fn mapopt_defaults() {
+        let aligner = Aligner::builder().map_ont();
+        println!("{:#?}", aligner.mapopt);       
+
+        let aligner = Aligner::builder();
+        println!("{:#?}", aligner.mapopt);
+    }
+
     #[test]
     fn build_aligner_memory_leak() {
         for _ in 0..100000 {